![]() This ratio is called the stoichiometric air-fuel ratio. When building an engine, it’s very important to know the air-fuel ratio at which exactly all the available oxygen is used to burn the fuel completely or atleast to the best possible value. If there’s too much fuel present, not all fuel will be burnt and un-burnt fuel will be pushed out through the exhaust valve. The amount of oxygen present in the cylinder is the limiting factor for the amount of fuel that can be burnt. The burning of fuel is basically the reaction of fuel with oxygen in the air. ![]() ![]() Internal combustion engines burn fuel to create kinetic energy.
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